exam Maths Puzzle Numerical Ability

how can i tell if a -674 is a interger or a whole number or a natural and are all numbers integers

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exam Other Question

Stan invested $5,000, part at 8% and part at 17%. If the total interest at the end of the year is $490, how much did he invest at 8%?

thank How do you solve (x+b)(x-b)=x(x-5) for x? I would like to see every step and it would be nice if you could explain why you did each step. Thank you very much.